I miss Cassie from pre-DCnU. We really need her back with a stronger connection to Diana (and Donna who needs some fixing too.) They'd never let what's happening to Cassie happen to the many Robins in the Batfamily - all still have a relatively strong connection to the Bat mythos.
Anyway, I like the Injustice look for Cassie, minus the tiara and shoulder guard. I'm not caught up on this take of the character, but it doesn't seem like a look for her from her past characterization in the main DCU.
Looking forward to the day we can have Cassie, Diana, Donna, Artemis, and Hippolyta all share in an adventure in the pages of Wonder Woman and have it make sense.